Which of the following tasks can a veterinary technician perform?

Filling prescriptions is a task that falls well within the scope of practice for a veterinary technician. Veterinary technicians are often responsible for the preparation and dispensing of medications, which includes accurately filling prescriptions as per the veterinarian's orders. They are trained to understand dosages, drug interactions, and the proper way to administer medications, making them competent in this task.

In contrast to filling prescriptions, tasks like performing surgery or prescribing drugs typically require a veterinarian's license and are not within the veterinary technician's legal scope of practice. Diagnosing diseases also falls under the veterinarian's domain, as it requires specific diagnostic skills and authority that technicians do not possess. Thus, the ability of a veterinary technician to fill prescriptions is a clear and well-defined responsibility in their role within veterinary medicine.